Light sensing touch panel and low-power driving control method thereof

Abstract

The present invention discloses a low-power driving control method of light sensing touch panel, which comprises the following steps: measuring the ambient light field intensity of the light sensing touch panel, and outputting a light field signal; outputting an amplification signal adapting to a touch signal according to the intensity of the light field signal; amplifying the touch signal according to the amplification signal, and driving the light sensing touch panel. The present invention further discloses a light sensing touch panel. The light sensing touch panel and the low-power driving control method thereof according to the present invention can reduce the power consumption of the touch panel without affecting the touch sensitivity.

What is claimed is: 
     
       1. A light sensing touch panel, which comprises a driving circuit, wherein, the driving circuit at least comprises:
 a light sensor, which is used to measure the ambient light field intensity of the light sensing touch panel and output a light field signal; 
 a touch signal amplifying controller, which is used to output an amplification signal adapting to a touch signal according to the intensity of the light field signal; and 
 an amplifier, which is used to amplify the touch signal according to the amplification signal and drive the light sensing touch panel; 
 wherein, the light sensor, the touch signal amplifying controller, and the amplifier are connected in sequence; 
 wherein the touch signal amplifying controller comprises: 
 a storage, which is used to store the amplification value; 
 a determiner, which is used to consider the intensity of the light field signal according to the light field signal; and 
 a selection controller, which is used to choose a magnification adapting to the touch signal, the storage and the determiner being respectively connected with the selection controller; 
 wherein, the driving circuit of the light sensing touch panel is turned on when there is no touch and is turned off when there is touch; the determiner considers if the intensity of the light field signal is larger than the predetermined value of the stored light field signal, if it is YES, choose a first magnification from the stored amplification value to adapt to the touch signal; if it is No, choose a second magnification from the stored amplification value to adapt to the touch signal; 
 wherein, the first magnification is larger than the second magnification. 
 
     
     
       2. The light sensing touch panel as claimed in  claim 1 , wherein the touch signal amplifying controller is further connected with an external switch used to adjust the amplification value to adapt to the touch signal. 
     
     
       3. The light sensing touch panel as claimed in  claim 1 , wherein the driving circuit further comprises a photodiode connected to the amplifier. 
     
     
       4. The light sensing touch panel as claimed in  claim 1 , wherein the touch signal amplifying controller is further connected with an external switch used to adjust the amplification value to adapt to the touch signal. 
     
     
       5. The light sensing touch panel as claimed in  claim 1 , wherein the driving circuit further comprises a photodiode connected to the amplifier. 
     
     
       6. The light sensing touch panel as claimed in  claim 1 , wherein the driving circuit of the light sensing touch panel is turned off when there is no touch and is turned on when there is touch; the determiner considers if the intensity of the light field signal is larger than the predetermined value of the stored light field signal, if it is YES, choose a first magnification from the stored amplification value to adapt to the touch signal; if it is No, choose a second magnification from the stored amplification value to adapt to the touch signal; wherein, the first magnification is smaller than the second magnification.